钦州湾海水养殖区水体有机磷酸酯的污染特征及生态风险

本文对广西钦州湾养殖区水体中11种常见的有机磷酸酯（OPEs）阻燃剂和增塑剂采用固相萃取和气质联用的分析方法进行了研究，结果表明11种OPEs的总浓度范围为32.9～227 ng/L，平均126 ng/L，处于国际上类似区域的较低水平。钦州湾养殖塘不同OPEs单体的含量水平主要受其自身的水溶性和辛醇-水分配系数（K_OW）影响。OPEs的生产与消费量也在一定程度上影响其含量水平。因此，TCEP、TCPP和TBEP是钦州湾养殖区水体中浓度最高的三种OPEs。总体上，OPEs在养殖塘水体中的浓度高于附近开放的河口与近岸海水，这可能是人为排放的OPEs通过养殖水源（河流与近岸海水）进入养殖塘并得以蓄积的结果。氯代OPEs在养殖塘表现出比非氯代OPEs更高的蓄积能力或持久性。目前，研究区域OPEs浓度水平对周围环境无显著生态影响，但由于其可能会富集在海产品中并通过食物暴露给人体，其健康风险不容忽视。

Occurrence and risk assessment of organophosphorus esters in surface water of mariculture farms in the Qinzhou bay,China

In this study, 11 organophosphorus esters (OPEs) in the surface water from mariculture farms, estuaries and the nearshore of the Qinzhou bay were analyzed. The total concentration of 11 OPEs averaged 126 ng/L and ranged from 32.9 to 227 ng/L the mean, which was at the lower level among the similar regions worldwide. The predominant contaminants were TCEP, TCPP and TBEP. The level of individual OPEs in the Qinzhou bay was mainly affected by their own aqueous solubilities and octanol-water partition coefficients (K_OW) as well as their productions and consumptions. In general, the concentrations of OPEs were higher in the aquaculture ponds than in the nearby estuaries and nearshore area. The OPEs accumulated in the ponds might be mainly from the sources of culture water: rivers and coastal water. Chlorinated OPEs were more persistent than non-chlorinated OPEs in the culture ponds. So far, the concentrations of OPEs in the study area have no significant ecological impact on the surrounding environment, but its potential threat to human cannot be ignored because of their possible bioaccumulation in seafood.